package top.fzqblog.test

import java.io.File

/**
 * Created by 抽离 on 2017/7/29 0029.
 */
fun main(args: Array<String>) {
    val files = File("test").listFiles()
    println(files?.size ?: "empty")

    val data = ""
    data?.let{
        println("data 不为空")//如果不为空执行该语句块
    }
}